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unix v7是最后一个广泛发布的研究型UNIX版本

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A TROFF Tutorial
.AU "MH 2C-518" 6021
Brian W. Kernighan
.AI
.MH
.OK
Typesetting
Text formatting
NROFF
.AB
.PP
.UL troff
is a text-formatting program for driving the Graphic Systems
phototypesetter on the
.UX
and
.UC GCOS
operating systems.
This device is capable of producing high quality
text;
this paper is an example of
.UL troff
output.
.PP
The phototypesetter itself normally runs with four fonts,
containing roman, italic and bold letters 
(as on this page),
a full greek alphabet, and a substantial number of
special characters and mathematical symbols.
Characters can be printed in a range of sizes,
and placed anywhere on the page.
.PP
.UL troff
allows the user full control over fonts,
sizes, and character positions,
as well as the usual features of a formatter _
right-margin justification, automatic hyphenation,
page titling and numbering, and so on.
It also provides macros, arithmetic variables and operations,
and conditional testing, for complicated formatting tasks.
.PP
This document is an introduction to the most basic use of
.UL troff .
It presents just enough information to enable the user
to do simple formatting
tasks like making viewgraphs,
and to make incremental changes to existing packages
of
.UL troff
commands.
In most respects, the 
.UC UNIX
formatter
.UL nroff
is identical to
.UL troff ,
so this document also serves as a tutorial on
.UL nroff .
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